The antlr/intellij-plugin-v4 repository is an IntelliJ IDEA plugin that provides comprehensive language support for ANTLR v4 grammar files (.g4). It offers syntax highlighting, real-time error checking, code navigation, refactoring capabilities (such as rule extraction and inlining), live parse tree preview, grammar profiling, and code generation. The plugin integrates deeply with the IntelliJ Platform SDK, implementing extension points like FileTypeFactory, ParserDefinition, SyntaxHighlighterFactory, ExternalAnnotator, StructureViewFactory, CompletionContributor, and custom tool windows. Its architecture follows a modular design where core functionality is separated into concerns such as parsing, preview, refactoring, and configuration, utilizing patterns like the adaptor pattern for ANTLR integration, background processing for UI responsiveness, and specialized token streams for incremental parsing.
This repository contains the client-side code for EASYME.md, a web-based markdown editor designed for creating and sharing README files. The application features a split-pane interface with a live markdown preview, a customizable toolbar for applying formatting, and functionality to share documents via a unique URL. Built with React, Redux, and Emotion, it demonstrates a well-structured single-page application with clear separation of concerns. The editor uses a textarea for input and leverages the `text-field-edit` library for precise text manipulations, enabling features like inserting text at the cursor position, wrapping selections, and handling keyboard shortcuts for common markdown syntax. State management is handled by Redux Toolkit with Redux Saga for side effects, such as fetching saved documents from a backend API. The application also supports offline drafting via localStorage and sharing via URL hash compression using `lz-string`. Key components include a dynamic toolbar with buttons for bold, italic, lists, tables, and more, each implemented as isolated, reusable components. The utility modules for URL sharing and draft storage are particularly noteworthy for their potential reuse in other projects. Despite some dependencies being slightly outdated, the codebase remains functional and maintainable.